/
ftola.s
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/
ftola.s
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/*
* Wolfenstein: Enemy Territory GPL Source Code
* Copyright (C) 1999-2010 id Software LLC, a ZeniMax Media company.
*
* ET: Legacy
* Copyright (C) 2012 Jan Simek <jsimek.cz@gmail.com>
*
* This file is part of ET: Legacy.
*
* ET: Legacy is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ET: Legacy is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ET: Legacy. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, Wolfenstein: Enemy Territory GPL Source Code is also
* subject to certain additional terms. You should have received a copy
* of these additional terms immediately following the terms and conditions
* of the GNU General Public License which accompanied the source code.
* If not, please request a copy in writing from id Software at the address below.
*
* id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
*
* @file ftola.s
* @brief fast floating point to long conversion.
*/
// 23/09/05 Ported to gas by intel2gas, best supporting actor Tim Angus
// <tim@ngus.net>
#include "qasm.h"
#if id386
.data
temp: .single 0.0
fpucw: .long 0
// Precision Control Field , 2 bits / 0x0300
// PC24 0x0000 Single precision (24 bits).
// PC53 0x0200 Double precision (53 bits).
// PC64 0x0300 Extended precision (64 bits).
// Rounding Control Field, 2 bits / 0x0C00
// RCN 0x0000 Rounding to nearest (even).
// RCD 0x0400 Rounding down (directed, minus).
// RCU 0x0800 Rounding up (directed plus).
// RC0 0x0C00 Rounding towards zero (chop mode).
// rounding towards nearest (even)
cw027F: .long 0x027F
cw037F: .long 0x037F
// rounding towards zero (chop mode)
cw0E7F: .long 0x0E7F
cw0F7F: .long 0x0F7F
.text
//
// int qftol( void ) - default control word
//
.globl C(qftol)
C(qftol):
fistpl temp
movl temp,%eax
ret
//
// int qftol027F( void ) - DirectX FPU
//
.globl C(qftol027F)
C(qftol027F):
fnstcw fpucw
fldcw cw027F
fistpl temp
fldcw fpucw
movl temp,%eax
ret
//
// int qftol037F( void ) - Linux FPU
//
.globl C(qftol037F)
C(qftol037F):
fnstcw fpucw
fldcw cw037F
fistpl temp
fldcw fpucw
movl temp,%eax
ret
//
// int qftol0F7F( void ) - ANSI
//
.globl C(qftol0F7F)
C(qftol0F7F):
fnstcw fpucw
fldcw cw0F7F
fistpl temp
fldcw fpucw
movl temp,%eax
ret
//
// int qftol0E7F( void )
//
.globl C(qftol0E7F)
C(qftol0E7F):
fnstcw fpucw
fldcw cw0E7F
fistpl temp
fldcw fpucw
movl temp,%eax
ret
//
// long Q_ftol( float q )
//
.globl C(Q_ftol)
C(Q_ftol):
flds 4(%esp)
fistpl temp
movl temp,%eax
ret
//
// long qftol0F7F( float q ) - Linux FPU
//
.globl C(Q_ftol0F7F)
C(Q_ftol0F7F):
fnstcw fpucw
flds 4(%esp)
fldcw cw0F7F
fistpl temp
fldcw fpucw
movl temp,%eax
ret
#endif